<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><html lang="en">
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>AdminLTE 3 | Registration Page</title>

    <!-- Google Font: Source Sans Pro -->
    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,400i,700&display=fallback">
    <!-- Font Awesome -->
    <link rel="stylesheet" href="/plugins/fontawesome-free/css/all.min.css">
    <!-- icheck bootstrap -->
    <link rel="stylesheet" href="/plugins/icheck-bootstrap/icheck-bootstrap.min.css">
    <!-- Theme style -->
    <link rel="stylesheet" href="/dist/css/adminlte.min.css">


</head>
<body class="hold-transition register-page">
<div class="register-box">
    <div class="register-logo">
        <a href="index2.html"><b>Admin</b>LTE</a>
    </div>

    <div class="card">
        <div class="card-body register-card-body">
            <p class="login-box-msg">Register a new membership</p>

            <form action="/admin/registerchk" method="post">
                <div class="input-group mb-3">
                    <input id="username" type="text" class="form-control" placeholder="请输入用户名" name="username"
                           onKeyUp="checkName()"
                    >
                    <div class="input-group-append">
                        <div class="input-group-text">
                            <span class="fas fa-user" ></span>
                        </div>
                    </div>
                </div>
                <div>
                    <span id="usernameInfo"></span>
                </div>
                <div class="input-group mb-3">
                    <input type="password" class="form-control" placeholder="请输入密码" name="password">
                    <div class="input-group-append">
                        <div class="input-group-text">
                            <span class="fas fa-lock"></span>
                        </div>
                    </div>
                </div>
                <div class="input-group mb-3">
                    <input type="password" class="form-control" placeholder="请输入重复密码">
                    <div class="input-group-append">
                        <div class="input-group-text">
                            <span class="fas fa-lock"></span>
                        </div>
                    </div>
                </div>
                <div class="row">
                    <div class="col-8">
                        <div class="icheck-primary">
                            <input type="checkbox" id="agreeTerms" name="terms" value="agree">
                            <label for="agreeTerms">
                                I agree to the <a href="#">terms</a>
                            </label>
                        </div>
                    </div>
                    <!-- /.col -->
                    <div class="col-4">
                        <button type="submit" class="btn btn-primary btn-block">Register</button>
                    </div>
                    <!-- /.col -->
                </div>
            </form>



            <a href="login.jsp" class="text-center">I already have a membership</a>
        </div>
        <!-- /.form-box -->
    </div><!-- /.card -->
</div>
<!-- /.register-box -->

<!-- jQuery -->
<script src="${pageContext.request.contextPath}/plugins/jquery/jquery.min.js"></script>
<!-- Bootstrap 4 -->
<script src="${pageContext.request.contextPath}/plugins/bootstrap/js/bootstrap.bundle.min.js"></script>
<!-- AdminLTE App -->
<script src="${pageContext.request.contextPath}/dist/js/adminlte.min.js"></script>


<script>
    // ajax对象
    var xmlHttpReq;


    function checkName()
    {
        // 当前界面使用的是bootstrap，使用了jQuery
        // $ jQuery的操作符
        // $("#username")  通过css选择器 找到 界面元素对象
        // $.ajax     jQuery ajax函数
        // { url: 请求地址,   resultType:返回数据的格式, success: 返回数据成功后的处理 }

        var username=$("#username").val();
        var url = "checkname?username="+username;
        console.log(url);
        $.ajax({
            url:url,
            resultType:"json",
            success:function (data)
            {
                console.log(data);
                console.log(data.result);
                if(data.result==false)
                {
                    console.log("不可用!")
                    $("#usernameInfo").html("用户名不可用");
                }
                else
                {
                    $("#usernameInfo").html();
                }
            }
        });

    }
    // function checkName()
    // {
    //   // 1. 获取用户填写用户名
    //   var username = document.getElementById("username").value;
    //
    //   // 2. 创建ajax对象
    //   xmlHttpReq = new XMLHttpRequest();
    //
    //   // 3. 设定处理函数
    //   xmlHttpReq.onreadystatechange = handle;
    //
    //
    //   // 4. 发送请求
    //   var url = "checkname?username="+username;
    //   xmlHttpReq.open("get",url,true); // true 表示 异步 false 同步
    //   xmlHttpReq.send(null);
    //
    // }
    //
    // function handle()
    // {
    //   if(xmlHttpReq.readyState == 4 && xmlHttpReq.status == 200)
    //   {
    //     console.log(xmlHttpReq.responseText);
    //
    //     var usernameInfo = document.getElementById("usernameInfo");
    //     console.log(usernameInfo);
    //
    //     var data = JSON.parse(xmlHttpReq.responseText);
    //     if(data.result==false)
    //     {
    //       usernameInfo.innerHTML = "用户名不可用"
    //     }
    //     else
    //     {
    //       usernameInfo.innerHTML = "";
    //     }
    //
    //
    //   }
    // }
</script>
</body>
</html>
